PRACTICE TEST 2-Class 10 – Science -Chemistry -Chapter 1

Welcome to your Ncert - class 10- science - Chapter 1 – Chemical Reactions and Equations 2

Anhydrous iron (III) chloride is prepared by:

combination

decomposition

neutralization

displacement

None

Identify the type reaction from the following.
$$H_{2}CO_{3}(aq)\rightarrow H_{2}O(l)+CO_{2}(g)$$

Double displacement reaction

Combustion reaction

Decomposition reaction

Displacement reaction

None

Which of the following is not a characteristic of a chemical reaction?

Change in color

None of the above

Change in temperature

Formation of precipitate

None

The mixture of carbon and sulphur is separated by using the solution of _________.

carbon monoxide

carbon disulphide

carbon dioxide

sulphur oxide

None

Chemical volcano is an example of:

none of the above

displacement reaaction

decomposition reaction

combination reaction

None

Identify the product(s) which will be formed by using the information provided about the reactants:
$$Al(s) + O_{2}(g) \rightarrow $$

$$Al_{2}O_{2}$$

$$Al_{3}O_{2}$$

$$Al_{2}O_{3}$$

$$Al_{3}O_{3}$$

None

Which of the following process involves chemical reaction?

Respiration

Cutting of tree

Formation of ice from water

Compression of sponge

None

You mix two colourless solutions and the resulting mixture becomes cloudy. What type of reaction is observed?

A physical reaction

A redox reaction

An acid base reaction

A precipitation reaction

None

When sodium hydroxide solution is added to copper sulfate solution, a blue precipitate of copper hydroxide is formed along with sodium sulfate solution. What kind of chemical reaction takes place between them?

Chemical displacement reaction

Chemical combination reaction

Chemical double decomposition reaction

Chemical decomposition reaction

None

10.

(i) Reaction between calcium oxide and water is a _______ reaction

(ii) Treatment of mercuric oxide with strong heat is a ________ reaction

Decomposition, Decomposition

Decomposition, Combination

Combination, Decomposition

Combination, Combination

None

11.

Which information is not conveyed by a balanced chemical equation?

Whether a particular reaction is actually feasible or not

Number of atoms/molecule of the reactants and products formed

Physical state of reactants and products

Symbols and formula of all the substance involved in a particular reaction

None

12.

Balanced chemical equations imply which of the following?

I. Numbers of molecules are conserved in chemical change

II. Numbers of atoms are conserved in chemical change.

III. Mass is conserved in chemical change.

II and III only

I and III only

IIonly

I only

None

13.

Which of the following pairs will give displacement reactions?

NaCl solution and copper metal

AgNO3 solution and copper metal.

FeSO4 solution and silver metal

MgCl2 solution and aluminium metal

None

14.

Take 5 mL of sodium sulphate solution in a test tube and 5 mL of barium chloride solution in another test tube. Mix the two solutions slowly and leave the test tube undisturbed for some time. A white precipitate is formed after some time.

Which of the following statements is correct about the above reaction?

It is a neutralisation reaction since an acid reacts with alkali to give a salt.

It is a double displacement reaction since exchange of ions occurs between the two reactants.

It is a displacement reaction since chloride ions are replaced by sulphate ions

It is a combination reaction since barium ions combine with sulphate ions to give barium sulphate.

None

15.

Calcium oxide reacts vigorously with water to produce slaked lime.
$$CaO(s)+ H_{2}O(l)\rightarrow Ca(OH)_{2}(aq)+ heat$$
This reaction can be classified which of the following?

(A) Combination reaction

(B) Exothermic reaction

(D) Decomposition reaction

(A), (C) and (D)

(A) and (B)

(A) and (C)

None

16.

Combustion reaction of coal is a/an __________ reaction.

exothermic

endothermic

None of these

auto-catalytic

None

17.

Choose the incorrect statement

Combination of two different elements is possible.

Decomposition of single compound is not possible.

A combination of an element with a compound to form a new product is possible.

Decomposition of a chemical compound into two new compounds is possible.

None

18.

The color of the coating formed on the metals such as iron, silver, and copper after corrosion will be:

Black in colour in all the metals

Brown, black and green in colour

Brown in colour in all the metals

Black, brown and green in colour

None

19.

Balancing of equations is based on:

Principle of conservation of momentum

Conditions for a chemical reaction to take place

Avogadro's number

Law of conservation of mass

None

20.

Study the following chemical reactions.
$$Fe+CuSO_{4}\rightarrow FeSO_{4}+Cu$$
$$
$$2AgNO_{3}+Cu\rightarrow Cu(NO_{3})_{2}+2Ag$$
The metals present in the reactions can be written in the increasing order of reactivity as:

Cu,Fe,Ag

Ag,Cu,Fe

Fe,Cu,Ag

Ag,Fe,Cu

None

Chapter 1 - Chemical Reaction and Equation

chapter 2- Acids, Bases and Salt

Chapter 3 – Metals and Non-metals

Chapter 4 – Carbon and its Compounds

Assertion and Reason chemistry

CASE BASED QUESTIONS

Curriculum

Ncert-Class 10 Science - Chemistry

Chapter 1 - Chemical Reaction and Equation

chapter 2- Acids, Bases and Salt

Chapter 3 – Metals and Non-metals

Chapter 4 – Carbon and its Compounds

Assertion and Reason chemistry

CASE BASED QUESTIONS

PRACTICE TEST 2-Class 10 – Science -Chemistry -Chapter 1 – Chemical Reaction and Equation